convicted rapist jerry sandusky makes a rambling defense of his innocence, but the judge has the final word. armen keteyian on the sentencing of the former penn state coach. elizabeth palmer takes us inside the compound in libya where the u.s. ambassador died, in his own bedroom. and byron pitts with angels in overalls. >> reporter: how do you see these women? are they girlfriends? neighbors? >> they're my heroes! (laughs) captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening. as of today we are down to the final four weeks of the presidential campaign. the focus is narrowing, not just to the nine battleground states but to one in particular-- ohio, which could tip the balance on election night. first the big picture. nationally, the latest gallup poll shows mitt romney leading president obama 49% to 47%. that spread is within the margin of error, so it's essentially a tie. in ohio, new polling today shows this: pollster a.r.g. has romney up by one point, 48% to 47%. but a cnn poll has the president up by four, 51% to 47%. either way, it'